I did like MacPhisto, Bono is actually very good at his characters and knows exactly how to play the very stuffy, creepy, old english gentlemen role. The Adelaide film is great for showing just how well he understood the character, he really is in Macphistos skin. In my mind he's more memorable than Mirrorball man who I could never really work out. As others have said I too didn't like him singing the songs with the accent, and I don't think he did it because he was in charcater, I just think it was easier for him to perform Ultraviolet and WOWY that way, i.e: easier for him to speak rather than sing the songs.
Popmart never really had any characters did it? A variety of different costumes and looks but never really a character to go with them, certainly no names, and looking at it now I'm glad. Zoo Tv was a moment in time and it worked for then, but let it be now.